基於特定值的分組數組

Question

我有一個基本數組，我希望根據x字段值對其進行分組。我想保持這些值仍然在一個數組中。我已經嘗試了多種foreach，for循環，但沒有運氣得到它我想要的。我怎樣才能達到以下的預期結果？

$originalArray = [ 
    [ 
     'x' => 'test', 
     'y' => 'blah', 
    ], 
    [ 
     'x' => 'test', 
     'y' => 'blah', 
    ], 
    [ 
     'x' => 'test2', 
     'y' => 'blah', 
    ], 
    [ 
     'x' => 'test2', 
     'y' => 'blah', 
    ], 
]; 

Desired Result: 
[ 
    'test' => [ 
     [ 
      'x' => 'test', 
      'y' => 'blah', 
     ], 
     [ 
      'x' => 'test', 
      'y' => 'blah', 
     ], 
    ], 
    'test2' => [ 
     [ 
      'x' => 'test2', 
      'y' => 'blah', 
     ], 
     [ 
      'x' => 'test2', 
      'y' => 'blah', 
     ], 
    ], 
]; 

Answer 1

希望這是你想要什麼：

$originalArray = [ 
    [ 
     'x' => 'test', 
     'y' => 'blah', 
    ], 
    [ 
     'x' => 'test', 
     'y' => 'blah', 
    ], 
    [ 
     'x' => 'test2', 
     'y' => 'blah', 
    ], 
    [ 
     'x' => 'test2', 
     'y' => 'blah', 
    ], 
]; 
$desired_array = array(); 
foreach ($originalArray as $key => $value) { 
    $desired_array[$value['x']][]=$value; 
} 
var_dump($desired_array);